Knowledge Base DIALux 4

How can we help you today?

Solid Angle

The plane angle a is determined by the length of the arc a and the radius r. The
biggest plane angle obtains for a full circle (2πr) over 2π.

Solid Angle

Analogously, the solid angle Ω describes the size of a sector in
three-dimensional space. It is the product of area A and the square of radius
r². The biggest solid angle obtains for a spherical surface (4πr²) over 4π.